Material: The drill socket adapter made from heat treated hardened Chrome Vanadium (Cr-V) Steel to ensure a long lifetime through tough torque jobs without breaking or rusting heavy duty construction to be compatible with the most powerful impact driver. SIZE: 1/4" 3/8" 1/2" impact driver bits and each with a 1/4 inch hex shank driver socket wrench adapter set.Convert any power tools set drill bit set into a nuts socket set. Different colour coded rings, make it easier to pick the right one. DESIGN: The spring ball lock ensures a tight fit into the driver head to prevent slipping during use. Double tooth hex shank specifically machined to fit securely into a hand held driver, drill driver or impact wrench. Multifunctional: The extension bit holder is designed to provide a securely locked in extension to your existing tool. Provides additional length to reach into a multitude of hard to reach space. Attach these extender bars to any powered or cordless drill chuck or Impact driver to